- published: 30 Jul 2008
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Magnetism is a property of materials that respond to an applied magnetic field. Permanent magnets have persistent magnetic fields caused by ferromagnetism. That is the strongest and most familiar type of magnetism. However, all materials are influenced varyingly by the presence of a magnetic field. Some are attracted to a magnetic field (paramagnetism); others are repulsed by a magnetic field (diamagnetism); others have a much more complex relationship with an applied magnetic field (spin glass behavior and antiferromagnetism). Substances that are negligibly affected by magnetic fields are known as non-magnetic substances. They include copper, aluminium, gases, and plastic. Pure oxygen exhibits magnetic properties when cooled to a liquid state.
The magnetic state (or phase) of a material depends on temperature (and other variables such as pressure and applied magnetic field) so that a material may exhibit more than one form of magnetism depending on its temperature, etc.
Aristotle attributed the first of what could be called a scientific discussion on magnetism to Thales of Miletus, who lived from about 625 BC to about 545 BC. Around the same time, in ancient India, the Indian surgeon, Sushruta, was the first to make use of the magnet for surgical purposes.
The flow of electrons aboard the compass
Tweaking the needle towards hell
Where the confluent harmony turns to fuzz
By field lines of anguish that encircle the cells
The neurons and the nerves
Depression colour's it's canvas
Inside the thinking canals, like curves
Magnetic waves wrap it's was
Like a sun from a distant universe
That burns down my soul
I suffer dejection's eternal curse
At it rules the corridors of my nole
I'm a magnet to emptiness
And I can't change the polarity
Attracting the drakness
Beyond the boundaries of modicity
As a dynamo for uncontrolled hate
Both rotator and stator
Storing the emotions in a mental crate
Swallowed by depression's generator
I am the engine and the turbine
For atrabilious accidents
I am privation divine
Molded by an ignitable element
By stars from a violent universe
As they sleep withing my soul
Pulling down an infinite curse
Into the coridors of my nole
I'm a magnet to emptiness
And I can't change the polarity
Attracting the drakness
Beyond the boundaries of modicity
As a dynamo for uncontrolled hate
Both rotator and stator
Storing the emotions in a mental crate